Donald Trump's second presidency was dealt a spinning blow by voters in Wisconsin Tuesday as they elected a liberal judge to the state's Supreme Court, despite his powerful advisor Elon Musk pouring millions into the race to sway the polls.

Two months into his barnstorming return to the White House, Trump celebrated victory in a pair of House races in Florida which remained in Republican hands.

But in the first real electoral test of his polarizing presidency, his all-out effort to lodge a new Republican on the Wisconsin Supreme Court fell flat, as liberal judge Susan Crawford came out ahead of Trump-backed Brad Schimel, according to US media.

Trump appeared to ignore the results on social media, highlighting a separate Wisconsin ballot initiative requiring voters to present photo identification to cast a ballot.

"Voter I.D. just approved in Wisconsin election...this is a big win for Republicans, maybe the biggest win of the night," he posted on TruthSocial late Tuesday.

Musk, who has spearheaded Trump's attempts to gut much of the US government in a right-wing cost-cutting drive, went to Wisconsin to........

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